FREE-ELECTRON LASERS IN THE X-RAY REGION.
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An x-ray free-electron laser (FEL) must operate with large gain per pass because of the poor quality of available mirrors at x-ray frequencies. The authors present a one-dimensional analysis of the gain regimes for x-ray FEL's and consider the example of a 5A FEL operating with a uniform wiggler of wavelength 3. 2 cm. They also estimate constraints on such a device imposed by effects such as diffractive spreading of the laser beam, energy spread and emittance of the electron beam, and transverse variations in the wiggler field.